US2082512A - Valve - Google Patents

Description

June 1, 1937. M. F. RICHARDSON 2,032,512

VALVE Filed Sept. 9, 1936 2 Sheets-Sheet 1 5 INIY/ENT'OR:

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Ji/ ORNEYS.

WITNESSES:

June 1, 1937. M. F. RICHARDSON 2,082,512

VALVE Filed Sept. 9, 1936 2 Sheets-Sheet 2 INVENTOR- 5 l fimrwe Elfzcizardsaw,

BY W

ORNEYS.

. WITNESSES.-

Patented June 1, 1 937- I UNITED STATES PATENT OFFICE vsnvn Maurice I. Richardlon, Berwrn, Pa.

Appl cation September 9.193s, Serial No. 99,908 3 Claims; (01. 251-144)- This invention has reference generally to valves of the kind commonly classified as disc valves;

- while it relates more particularly, although not essentially, to valves primarily designed for heavy duty service. In other words, my present improvements relate to valves for use in pumps capable of operating on heavy-grade or semiiluent liquids such as crude-oils, molasses, residuum and so forth.

Valves of the kind referred to as hitherto constructed usually include guide means for the disc element and stop means determining thelimit of lift for said element. Such valves are subject to many disadvantages, pre-eminent among which is the tendency of the disc element to "cant or tilt and lamb under the differential pressures set up between the valve and'seat contacting areas relative to the non-contacting areas, as well as due to the inherently variable viscosity of the liquid being operated upon. Furthermore, this canting" or jambing of the disc element rapidly results in its deformation with incidental injury to the seating areas.

The primary object of this invention is to provide a valve for the purpose stated which includes means effective to automatically restore the disc element when canted to proper balance in parallel relation with respect to the seat member v and the stop means. a Another object is to, prevent the valve disc from becoming jambed" in an inclined position, whereby its .distortion and injury to the seating area are obviated.

Afurther object is tofurnish a valve, of-the type above referred to, which embodies structural refinements that increase its eiiiciency and durability.

The recited objects, with others, and advantages of my invention will be apparent to those skilled in the art upon a reading of the subjoined description, and claims, in conjunction with the accompanying drawings; in which,

Fig. I is a top plan view of a'valve unit embodying the present improvements. Fig. II is a vertical section taken as indicated by the staggered line 11-11 in Fig. I.

Fig. 111 is a view, similar to Fig. 11, showing the valve disc in canted or inclined position; and,

Fig. IV is a corresponding illustration showing the valve disc at maximum lift" or in full open position.

Referring more in detail to the drawings, my improved valve comprises a ported seat member I embodying a central boss 2 and radial webs 3 defining flow passages therethrough. The seat.

member i is, exteriorly, slightly tapered downwards for forced-fit engagement in the usual partitlon or pump-chest deck, notvshown, or elsewhere as desired.

The valve stem 4 is threaded at its lower part for a sufllcient length, for jamb'fltment into a correspondingly-threaded axial hole 5 in the valve seat member boss 2, while the upper portion thereof is similarly screw-threaded at 6 to receive a valve guard or stop means I. This stop means 1 is locked against displacement by an interposed sleeve 8 and a split-cotter 9 passed through a diametric hole III, in the reduced upper extremity ll of the stem 4.

The stop means I, it will be observed, is of somewhat dished formation and embodies a central boss ii that is polygonally-shaped at It, for

application of-an appropriate tool, whereby said stop means may be applied to, or removed from, the valve stem 4, as well as jambed down against the sleeve 8, in an obvious manner. In addition the stop means I is formed of undulate or somewhat corrugate cross-section to provide a surrounding, skirt-portion l4 and an inner annular guard section ii, to limit the lift" of the valve disc l6, slightly inset relative to the lower edge of said skirt portion, and also defining concentric annular recessesfor a purpose later noted.

The valve disc I6 is conveniently, although not essentially, struck, or otherwise formed, from sheet metal to provide a central orifice having an outwardly rolled or half-round sectional surface H, for free guidance over the sleeve 8 aforesaid,

and for a purpose later on explained. The valve disc I6 is also shaped to provide outer and inner concentric seating surfaces ll, l8, respectively, with an intervening arched ridge 20, and a circumferential upwardly curved rim 2|.

1 Interposed between the valve disc l6 and the stop means I, in the concentric recesses of the latter, are outer and inner co-axial helical springs 22, 23 in compression and of' different gauge and pressure. These helical springs 22, 23 are of diameters .to exert their force against the valve disc seating surfaces l8, l9, respectively, at the regions where the arched ridge 2!! merges'into said surfaces, as will be clearly seen in Figs. II-IV. Particular attention is drawn, at this juncture, to the fact that the outer spring ills of a gauge, so that when completely collapsed, incident to "canting or tilting of the valve disc It, as shown in Fig. III, it eilectively prevents actual metal to metal contact between the upper surface of the arched ridge!!! with the underside of the registering surface of the guard section II: also, the gauge of the inner spring 'is such that when collapsed, as shown in Fig. 1V, it effectively cushions the central portion of the valve disc it while permitting the upper surface of the 5 arched ridge II to be arruted by the guard section ll of the stop means 1. Furthermore, when both springs 22, 23, are expanded, as shown-in Fig. II, it will be seen that the valve disc seating surfaces II, II,- are eflectively seated on the annular surfaces 24, II of the rim and hub portions of the'ported seat member I, in an obvious man ner.

From the foregoing it will be readily understood that at the commencement of operation of a pump, iltted with valves of the type described and shown, or when it is moving slowly to start' pumping a heavy liquid such as hereinbefore noted, the outside spring 22 permits the valve disc I. to open like a clam-shell and, before striking the guard ii, it is stopped by the con-' volutions of said spring being brought into metal to metal contact. As the pump accumulates liquid, the clam-shell action of the valve disc ll reduces, until said disc is opened evenly all 25 around in opposition to the pressure of both springs 22, 23 whereupon it is arrested by the guard it instead of by contacting relation being set up between the convolutions of the-outer spring 22. This clam-shell action is materially aided by provision of the rolled edge I! around the orifice through a valve disc it, while Jambing" of said disc against the sleeve I is eliminated. with resultant prevention of distortion of the inner seating surface I! of the disc II and 5 grooving of the outer seat surface 14 of the ported member l.}

From the foregoing the merits and advantages of my invention are deemed fully apparent to those skilled in the art. while it is obvious the ,40 inventive ideas set forth may be varied in minor details without departure from the 'scope'of said invention as deflnedin thefollowing claims. Having thus described my invention, I claim:

l. A valve comprising a ported seat member as with a central stem; stop means threaded on the with the guard section without metal to metal compression-of their convolutions. 1'5

- 2. A valve comprising a ported seat member. with a central stem; stop means threaded 'on the stem upper portion and embodying annular recesses with an intervening guard section and a co-axial' polygonal manipulator extension: s- 2 sleeve on the stem spacing the seat member and stop means: an axially apertured valve disc intermediate the seat member and stop means having its aperture rounded for free tilting coaction with the sleeve aforesaid, said-disc em- 25 bodying outer and inner seating surfaces separated by an annular arched ridge and also having an upwardly curved circumferential rim; and outer andinner concentric helical-springs of differential strength between the stop means annular recesses and the valve disc seating surfaces where the latter merge with the arched ridge, one of said springs serving to prevent the valve disc when tilted from striking the guard section, and said springs jointly permitting the valve disc to lift into even contact with the-guard section without jambing around the stem sleeve or distorting its inner seating surface. v

3. The combination of claim 2 wherein the valve stem upper end is reduced and diametri- 40 cally pierced for reception of a split cotter pin to lock the parts in assembled relation, and the outer helical-spring is of the greater strength.

assumes: r. memoir. 48

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